CN110363678A - A kind of transmission and distribution network coordinated planning method considering strong or weak relation - Google Patents

A kind of transmission and distribution network coordinated planning method considering strong or weak relation Download PDF

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CN110363678A
CN110363678A CN201910456739.6A CN201910456739A CN110363678A CN 110363678 A CN110363678 A CN 110363678A CN 201910456739 A CN201910456739 A CN 201910456739A CN 110363678 A CN110363678 A CN 110363678A
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kilovolts
node
nodes
power grid
planned
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CN110363678B (en
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刘巨
李梦颖
杨东俊
杜治
赵红生
王博
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State Grid Corp of China SGCC
Wuhan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
Wuhan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract

A kind of transmission and distribution network coordinated planning method considering strong or weak relation, this method first establishes the electrical distance matrix S that 500 kilovolts of nodes in power grid to be planned pass through 220 kilovolts and following voltage class grid contact, region division is carried out to 500 kilovolts of nodes in conjunction with sub-area division basic principle, using clustering methodology, and its rank order is determined according to the short circuit current size of 500 kilovolts of nodes, 220 kv grid planning finally are carried out to the rank order of 500 kilovolts of nodes in different zones.The design not only improves the power supply reliability and safety of power grid, but also is conducive to the operational efficiency for promoting transmission and distribution network, the transition investment construction for avoiding power grid.

Description

A kind of transmission and distribution network coordinated planning method considering strong or weak relation
Technical field
The invention belongs to field of power systems, and in particular to a kind of power transmission and distribution for considering each voltage class power grid strong or weak relation Net coordinated planning method.
Background technique
Scientific and reasonable Electric Power Network Planning technology is to ensure the precondition of power system security, reliability and economy. As China's economy enters new normality, China's power network development has turned to high quality period of expansion by high-speed development period, and Electric Power Network Planning needs Accomplish that making good use of storage vitalizes increment, gives full play to the transmission and distribution network ability of power grid.In practice, people generally use each electricity The strategy for pressing hierarchical system hierarchical planning is planned for the power grid of different voltages grade using different methods, such as document: Space truss project method (HYDROELECTRIC ENERGY science, 2016,34 (9): 200-204), major network and the power distribution network that power transmission and distribution are coordinated are coordinated to advise The evaluation index and planing method (Automation of Electric Systems, 2010,34 (15): 37-41) drawn coordinate evaluation index from main distribution Aspect is started with, and the method for main distribution planning is proposed, to solve in main distribution planning process between economy and reliability Coordinate.Since different voltages level Grid is mutually closely connected, mutually restricts between transmission and distribution network, using by each voltage class system The planning of system hierarchical planning, the less coordination considered between transmission and distribution network, it may be difficult to give full play to the transmission and distribution network ability of power grid.
Summary of the invention
It can the purpose of the present invention is in view of the above-mentioned problems existing in the prior art, providing a kind of operation for being able to ascend power grid By property and safety, the transmission and distribution network coordinated planning method for reducing the considerations of power grid construction cost strong or weak relation.
In order to achieve the above object, technical scheme is as follows:
It is a kind of consider strong or weak relation transmission and distribution network coordinated planning method, successively the following steps are included:
Step A, 500 kilovolts of nodes are established in power grid to be planned and pass through 220 kilovolts and following voltage class grid contact Electrical distance matrix S；
Step B, according to electrical distance matrix S and sub-area division basic principle, using clustering methodology to power grid to be planned 500 kilovolts of interior nodes carry out region division, and determine its rank order according to the short circuit current size of 500 kilovolts of nodes；
Step C, 220 kv grid planning are carried out according to the rank order of 500 kilovolts of nodes in different zones.
In step B, the region division successively the following steps are included:
Step B1, the Attraction Degree matrix R and degree of membership matrix A in power grid to be planned between 500 kilovolts of nodes are established:
In above formula, RijIts Attraction Degree to node j when to be clustered centered on node i, AijTo be gathered centered on node i Node j is to its degree of membership when class, and i=1,2 ..., N, j=1,2 ..., N, N are of 500 kilovolts of nodes in power grid to be planned Number；
Step B2, Attraction Degree matrix R is carried out according to following rule, the iteration of degree of membership matrix A updates:
As i ≠ j,
As i=j,
In above formula, SijFor the element in electrical distance matrix S, the opposite electrical distance between node i and node j, t are indicated For Rij、SijThe number of iterations, λ be iterative attenuation coefficient, i=1,2 ..., N, i'=1,2 ..., N, j=1,2 ..., N, j'= 1,2,…,N；
Step B3, the central node j for dividing clustering class is determined according to the following formula*:
j*Z=argmaxj(Aij+Rij)
In above formula, if i=j, node i is the cluster centre of point group, if i ≠ j, node j is the cluster centre of point group, I=1,2 ..., N, j=1,2 ..., N；
Step B4, circulating repetition step B2, step B3 be with continuous iteration, remain unchanged when the result of continuous several times iteration or Cluster result is exported after reaching maximum number of iterations；
Step B5, the subregion basic principle individually run in flakes according to cluster result and power grid at least 3 500 kilovolts of main transformers Region division is carried out to 500 kilovolts of nodes in power grid to be planned.
In step B, the short circuit current size according to 500 kilovolts of nodes determines that its rank order refers to:
The short circuit current of each 500 kilovolts of nodes in power grid to be planned is calculated under system large load operation mode, if certain is saved The short circuit current and the specified breaking current of the Node Switch of point meet following relationship, then determine the node for Qiang Jiedian, otherwise Determine the node for weak bus:
In above formula, IiFor the short circuit current of node i, INiFor the specified breaking current of node i switch.
The step C successively the following steps are included:
Step C1, the region division result obtained according to step B cut-offs interregional interconnection, forms multiple regions electricity Net；
Step C2, it is determined according to the development of the load of each regional power grid, substation site selection condition and increases 220 kilovolts of sections in region newly Point and transformer situation；
Step C3, according to the route between the increase in demand of regional power grid regional power grid Nei Ge substation.
The step C3 are as follows:
If all 500 kilovolts of nodes in regional power grid are weak bus, when the region increases 220 kilovolts of websites newly, Increase newly-increased 220 kilovolts of websites to the route of 500 kilovolts of nodes, 220 kilovolts of buses, enhances 220,000 between 500 kilovolts of nodes Lie prostrate electrical link；
If all 500 kilovolts of nodes in regional power grid are strong node, when the region increases 220 kilovolts of websites newly, By connection to other 220 kv substations far from 500 kilovolts of nodes, 220,000 between 500 kilovolts of nodes are not increased Lie prostrate electrical link；
If the existing strong node of 500 kilovolts of nodes in regional power grid has weak bus again, at the newly-increased 220 kilovolts of stations in the region When point, by connection to 500 kilovolts of weak bus sides, the trend for weakening 220 kv grids is passed through.
The step A successively the following steps are included:
Step A1, the electrical of 500 kilovolts and above being located between 500 kilovolts of nodes in power grid to be planned is deleted The admittance matrix Y between each node is established after connection equipment:
In above formula, as i ≠ j, YijFor the transadmittance between node i and node j, as i=j, YijFor node i from Admittance, i=1,2 ..., K, j=1,2 ..., K, K are 500 kilovolts in power grid to be planned and following voltage class node total number, M are The number of 220 kilovolts and following voltage class node in power grid to be planned；
Step A2,220 kilovolts and following voltage class node are eliminated by matrixing, obtained between 500 kilovolts of nodes Admittance matrix YY:
Step A3, the electrical distance matrix S between each node is calculated according to admittance matrix YY:
In above formula, as i ≠ j, ZijFor the transfger impedance between node i and node j, SijBetween node i and node j Opposite electrical distance, as i=j, ZijFor the self-impedance of node i, SijFor the reference electrical distance of node i, i=1,2 ..., N, j=1,2 ..., N.
Compared with prior art, the invention has the benefit that
A kind of transmission and distribution network coordinated planning method for considering strong or weak relation of the present invention first establishes in power grid to be planned 500 kilovolts Node by the electrical distance matrix S of 220 kilovolts and following voltage class grid contact, in conjunction with sub-area division basic principle, Region division is carried out to 500 kilovolts of nodes using clustering methodology, and it is determined according to the short circuit current size of 500 kilovolts of nodes Rank order finally carries out 220 kv grid planning to the rank order of 500 kilovolts of nodes in different zones, and the design passes through Power grid major network partition of nodes and node rank order determine, sufficiently coordinate the strong or weak relation of each voltage class power grid, can not only Weaken the electromagnetic looped network problem between different voltages level Grid, promotes the power supply reliability and safety of power grid, and be conducive to Each voltage class equipment for power transmission and distribution is made full use of, to promote the operational efficiency of transmission and distribution network, the transition investment of power grid is avoided to build If meanwhile the design can also develop in harmony to assess for power grid transmission and distribution network and provide reference frame.Therefore, the present invention is not only promoted The power supply reliability and safety of power grid, and be conducive to promote the operational efficiency of transmission and distribution network, avoid the transition of power grid from throwing Money construction.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is 220 kilovolts and 500 kilovolts grid structure schematic diagrames of power grid described in the embodiment of the present invention 1.
Fig. 3 is 500 kilovolts of node region division result schematic diagrames of power grid described in the embodiment of the present invention 1.
Fig. 4 is the grid structure schematic diagram after the coordinated planning of power grid described in the embodiment of the present invention 1.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
Referring to Fig. 1, it is a kind of consider strong or weak relation transmission and distribution network coordinated planning method, successively the following steps are included:
Step A, 500 kilovolts of nodes are established in power grid to be planned and pass through 220 kilovolts and following voltage class grid contact Electrical distance matrix S；
Step B, according to electrical distance matrix S and sub-area division basic principle, using clustering methodology to power grid to be planned 500 kilovolts of interior nodes carry out region division, and determine its rank order according to the short circuit current size of 500 kilovolts of nodes；
Step C, 220 kv grid planning are carried out according to the rank order of 500 kilovolts of nodes in different zones.
In step B, the region division successively the following steps are included:
Step B1, the Attraction Degree matrix R and degree of membership matrix A in power grid to be planned between 500 kilovolts of nodes are established:
In above formula, RijIts Attraction Degree to node j when to be clustered centered on node i, AijTo be gathered centered on node i Node j is to its degree of membership when class, and i=1,2 ..., N, j=1,2 ..., N, N are of 500 kilovolts of nodes in power grid to be planned Number；
Step B2, Attraction Degree matrix R is carried out according to following rule, the iteration of degree of membership matrix A updates:
As i ≠ j,
As i=j,
In above formula, SijFor the element in electrical distance matrix S, the opposite electrical distance between node i and node j, t are indicated For Rij、SijThe number of iterations, λ be iterative attenuation coefficient, i=1,2 ..., N, i'=1,2, N, j=1,2 ..., N, j'=1, 2,…,N；
Step B3, the central node j for dividing clustering class is determined according to the following formula*:
j*=argmaxj(Aij+Rij)
In above formula, if i=j, node i is the cluster centre of point group, if i ≠ j, node j is the cluster centre of point group, I=1,2 ..., N, j=1,2 ..., N；
Step B4, circulating repetition step B2, step B3 be with continuous iteration, remain unchanged when the result of continuous several times iteration or Cluster result is exported after reaching maximum number of iterations；
Step B5, the subregion basic principle individually run in flakes according to cluster result and power grid at least 3 500 kilovolts of main transformers Region division is carried out to 500 kilovolts of nodes in power grid to be planned.
In step B, the short circuit current size according to 500 kilovolts of nodes determines that its rank order refers to:
The short circuit current of each 500 kilovolts of nodes in power grid to be planned is calculated under system large load operation mode, if certain is saved The short circuit current and the specified breaking current of the Node Switch of point meet following relationship, then determine the node for Qiang Jiedian, otherwise Determine the node for weak bus:
In above formula, IiFor the short circuit current of node i, INiFor the specified breaking current of node i switch.
The step C successively the following steps are included:
Step C1, the region division result obtained according to step B cut-offs interregional interconnection, forms multiple regions electricity Net；
Step C2, it is determined according to the development of the load of each regional power grid, substation site selection condition and increases 220 kilovolts of sections in region newly Point and transformer situation；
Step C3, according to the route between the increase in demand of regional power grid regional power grid Nei Ge substation.
The step C3 are as follows:
If all 500 kilovolts of nodes in regional power grid are weak bus, when the region increases 220 kilovolts of websites newly, Increase newly-increased 220 kilovolts of websites to the route of 500 kilovolts of nodes, 220 kilovolts of buses, enhances 220,000 between 500 kilovolts of nodes Lie prostrate electrical link；
If all 500 kilovolts of nodes in regional power grid are strong node, when the region increases 220 kilovolts of websites newly, By connection to other 220 kv substations far from 500 kilovolts of nodes, 220,000 between 500 kilovolts of nodes are not increased Lie prostrate electrical link；
If the existing strong node of 500 kilovolts of nodes in regional power grid has weak bus again, at the newly-increased 220 kilovolts of stations in the region When point, by connection to 500 kilovolts of weak bus sides, the trend for weakening 220 kv grids is passed through.
The step A successively the following steps are included:
Step A1, the electrical of 500 kilovolts and above being located between 500 kilovolts of nodes in power grid to be planned is deleted The admittance matrix Y between each node is established after connection equipment:
In above formula, as i ≠ j, YijFor the transadmittance between node i and node j, as i=j, YijFor node i from Admittance, i=1,2 ..., K, j=1,2 ..., K, K are 500 kilovolts in power grid to be planned and following voltage class node total number, M are The number of 220 kilovolts and following voltage class node in power grid to be planned；
Step A2,220 kilovolts and following voltage class node are eliminated by matrixing, obtained between 500 kilovolts of nodes Admittance matrix YY:
Step A3, the electrical distance matrix S between each node is calculated according to admittance matrix YY:
In above formula, as i ≠ j, ZijFor the transfger impedance between node i and node j, SijBetween node i and node j Opposite electrical distance, as i=j, ZijFor the self-impedance of node i, SijFor the reference electrical distance of node i, i=1,2 ..., N, j=1,2 ..., N.
The principle of the present invention is described as follows:
The present invention provides a kind of transmission and distribution network coordinated planning methods for considering strong or weak relation, initially set up power grid 500,000 The electrical distance matrix that node passes through 220 kilovolts and following voltage class grid contact is lied prostrate, it is substantially former then in conjunction with sub-area division Subregion is then carried out to 500 kilovolts of nodes using clustering methodology, is then determined by calculating the short circuit current of 500 kilovolts of nodes Its strong or weak relation is realized defeated finally for the strong or weak relation combination between 500 kilovolts of nodes in different zones using different principles Distribution coordinated planning.This method can not only ensure the high reliability of power grid, together by the strong and weak complementary relationship between transmission & distribution net When can also reduce the construction cost of power grid, the development for promoting power grid simple, strong and orderly.
Embodiment 1:
Referring to Fig. 1, a kind of transmission and distribution network coordinated planning method considering strong or weak relation, this method is pair with China's power grid As (power grid has 31 nodes, wherein 500 kilovolts node 5, power plant's node 2,220 kilovolts node 24, rack knot Structure schematic diagram is as shown in Figure 2), successively follow the steps below:
Step 1, the electrical link for deleting 500 kilovolts and above being located between 500 kilovolts of nodes in power grid are set The admittance matrix Y between each node is established after standby:
In above formula, as i ≠ j, YijFor the transadmittance between node i and node j, as i=j, YijFor node i from Admittance, i=1,2 ..., K, j=1,2 ..., K, K are 500 kilovolts in power grid to be planned and following voltage class node total number, M are The number of 220 kilovolts and following voltage class node in power grid to be planned；
Step 2 eliminates 220 kilovolts and following voltage class node by matrixing, obtains 500 kilovolts of nodes (number Respectively 1,11,16,17,23) between admittance matrix YY:
The admittance matrix YY that the present embodiment obtains are as follows:
Step 3, the electrical distance matrix S being calculated according to admittance matrix YY between each node:
In above formula, as i ≠ j, ZijFor the transfger impedance between node i and node j, SijBetween node i and node j Opposite electrical distance, as i=j, ZijFor the self-impedance of node i, SijFor the reference electrical distance of node i, i=1,2 ..., N, j=1,2 ..., N；
The electrical distance matrix S that the present embodiment obtains is；
Step 4 establishes Attraction Degree matrix R and degree of membership matrix A in power grid to be planned between 500 kilovolts of nodes:
In above formula, RijIts Attraction Degree to node j when to be clustered centered on node i, AijTo be gathered centered on node i Node j is to its degree of membership when class, and i=1,2 ..., N, j=1,2 ..., N, N are of 500 kilovolts of nodes in power grid to be planned Number；
Step 5, the iteration update that Attraction Degree matrix R, degree of membership matrix A are carried out according to following rule:
As i ≠ j,
As i=j,
In above formula, SijFor the element in electrical distance matrix S, the opposite electrical distance between node i and node j, t are indicated For Rij、SijThe number of iterations, λ be iterative attenuation coefficient, i=1,2 ..., N, i'=1,2 ..., N, j=1,2 ..., N, j'= 1,2,…,N；
Step 6 determines the central node j for dividing clustering class according to the following formula*:
j*Z=argmaxj(Aij+Rij)
In above formula, if i=j, node i is the cluster centre of point group, if i ≠ j, node j is the cluster centre of point group, I=1,2 ..., N, j=1,2 ..., N；
Step 7, circulating repetition step 5, step 6 are with continuous iteration, when the result of continuous several times iteration remains unchanged or reaches Cluster result is exported after to maximum number of iterations；
Step 8, the subregion basic principle individually run in flakes according to cluster result and power grid at least 3 500 kilovolts of main transformers To in power grid to be planned 500 kilovolts of nodes carry out region division, as a result as shown in figure 3, need to cut-off route 6-7,4-14 and 6-19,500 kilovolts of nodes 1 are individually for 1, and 500 kilovolts of nodes 11 are individually for a piece of, and 500 kilovolts of nodes 16,17 and 23 are one Piece；
Step 9, the short circuit current that each 500 kilovolts of nodes in power grid to be planned are calculated under system large load operation mode, If the specified breaking current of the short circuit current of certain node and the Node Switch meets following relationship, determine the node for Qiang Jie Otherwise point determines the node for weak bus:
In above formula, IiFor the short circuit current of node i, INiFor the specified breaking current of node i switch；
500 kilovolts of node rank orders of the present embodiment determine result referring to table 1:
1 500 kilovolts of node short circuit currents of table and strong and weak property list
Node serial number Short circuit current (kilo-ampere) Breaking current (kilo-ampere) Strong and weak characteristic
1 62.4 63 By force
11 39.2 63 It is weak
16 54.4 63 By force
17 46.4 63 It is weak
23 41.2 63 It is weak
Step 10, the region division result obtained according to step 8 cut-off interregional interconnection, form multiple regions electricity Net；
Step 11 determines that increasing 220 kilovolts in region newly saves according to the development of the load of each regional power grid, substation site selection condition Point and transformer situation；
Step 12, according to the route between the increase in demand regional power grid Nei Ge substation of regional power grid, specifically:
If all 500 kilovolts of nodes in regional power grid are weak bus, when the region increases 220 kilovolts of websites newly, Increase newly-increased 220 kilovolts of websites to the route of 500 kilovolts of nodes, 220 kilovolts of buses, enhances 220,000 between 500 kilovolts of nodes Lie prostrate electrical link；
If all 500 kilovolts of nodes in regional power grid are strong node, when the region increases 220 kilovolts of websites newly, By connection to other 220 kv substations far from 500 kilovolts of nodes, 220,000 between 500 kilovolts of nodes are not increased Lie prostrate electrical link；
If the existing strong node of 500 kilovolts of nodes in regional power grid has weak bus again, at the newly-increased 220 kilovolts of stations in the region When point, by connection to 500 kilovolts of weak bus sides, the trend for weakening 220 kv grids is passed through；
For one power grid of subregion where node 1, since the node is Qiang Jiedian, newly-increased website avoid as far as possible from 1 outlet of node increases the main access node 2 of website, node 3 and node 5, node 6 newly；For two electricity of subregion where node 11 Net, since the node is weak bus, it is electrical to enhance 220 kilovolts to increase the route of 11-g7 and 11-g8 in newly-increased website Connection；Its outlet 23-g1- is increased when increasing website newly for weak bus 23 for three power grid of subregion where node 16,17,23 20 and 23-g2-19, the electrical link between appropriate reinforcement 220 kv grid of region and 500 kilovolts of nodes, for strong node 16, website g3 outlet is increased newly to node 15 and node 28, avoids direct outlet to node 16, the grid structure after coordinated planning is such as Shown in Fig. 4.
For the validity for investigating the method for the present invention, power flow stability analysis is carried out respectively to the power grid for planning forward and backward, the two 500 KV line N-1 are as shown in table 2 with the power transfer case after tower N-2:
The planning of table 2 front and back system electromagnetism passes through situation table
As shown in Table 2 known to data: between original node 1 and node 11, being deposited between node 1 and node 16, node 17, node 23 High-low pressure power flow transfer ratio be reduced to 0% by 12.4% and 26.9%, i.e. original is present between node 1 and node 11, High and low electromagnetic circle net between node 1 and node 16, node 17, node 23 is fully opened；Meanwhile being originally present in section Point 16 and the high-low pressure power flow transfer ratio between node 17, node 16 and node 23, node 17 and node 23 by 40.7%, 22.7% and 29.5% is reduced to 31.4%, 15.9% and 28.4%, i.e. height between node 16, node 17 and node 23 Low voltage electromagnetic looped network is also alleviated.
In conclusion the method for the invention can weaken the electromagnetic looped network problem between different voltages level Grid, promoted The power supply reliability and safety of power grid, at the same can abundant each voltage class equipment for power transmission and distribution of benefit, be conducive to promote power transmission and distribution The operational efficiency of net and then the transition investment construction for avoiding power grid.

Claims (6)

1. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation, it is characterised in that:
The method successively the following steps are included:
Step A, 500 kilovolts of nodes are established in power grid to be planned and pass through the electrical of 220 kilovolts and following voltage class grid contact Distance matrix S；
Step B, according to electrical distance matrix S and sub-area division basic principle, using clustering methodology in power grid to be planned 500 kilovolts of nodes carry out region division, and determine its rank order according to the short circuit current size of 500 kilovolts of nodes；
Step C, 220 kv grid planning are carried out according to the rank order of 500 kilovolts of nodes in different zones.
2. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation according to claim 1, it is characterised in that:
In step B, the region division successively the following steps are included:
Step B1, the Attraction Degree matrix R and degree of membership matrix A in power grid to be planned between 500 kilovolts of nodes are established:
In above formula, RijIts Attraction Degree to node j when to be clustered centered on node i, AijTo cluster the time centered on node i Point j is to its degree of membership, and i=1,2 ..., N, j=1,2 ..., N, N are the number of 500 kilovolts of nodes in power grid to be planned；
Step B2, Attraction Degree matrix R is carried out according to following rule, the iteration of degree of membership matrix A updates:
As i ≠ j,
As i=j,
In above formula, SijFor the element in electrical distance matrix S, indicate that the opposite electrical distance between node i and node j, t are Rij、SijThe number of iterations, λ be iterative attenuation coefficient, i=1,2 ..., N, i'=1,2 ..., N, j=1,2 ..., N, j'=1, 2,…,N；
Step B3, the central node j for dividing clustering class is determined according to the following formula*:
j*=argmaxj(Aij+Rij)
In above formula, if i=j, node i is the cluster centre of point group, if i ≠ j, node j is the cluster centre of point group, i= 1,2 ..., N, j=1,2 ..., N；
Step B4, circulating repetition step B2, step B3 are with continuous iteration, when the result of continuous several times iteration remains unchanged or reaches Cluster result is exported after maximum number of iterations；
Step B5, it is treated according to cluster result and power grid the subregion basic principle that at least 3 500 kilovolts of main transformers are individually run in flakes Plan that 500 kilovolts of nodes in power grid carry out region division.
3. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation according to claim 1 or 2, feature exist In:
In step B, the short circuit current size according to 500 kilovolts of nodes determines that its rank order refers to:
The short circuit current of each 500 kilovolts of nodes in power grid to be planned is calculated under system large load operation mode, if certain node The specified breaking current of short circuit current and the Node Switch meets following relationship, then determines that the node for Qiang Jiedian, otherwise determines The node is weak bus:
In above formula, IiFor the short circuit current of node i, INiFor the specified breaking current of node i switch.
4. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation according to claim 1 or 2, feature exist In:
The step C successively the following steps are included:
Step C1, the region division result obtained according to step B cut-offs interregional interconnection, forms multiple regions power grid；
Step C2, according to the load of each regional power grid development, substation site selection condition determine in region increase newly 220 kilovolts of nodes with And transformer situation；
Step C3, according to the route between the increase in demand of regional power grid regional power grid Nei Ge substation.
5. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation according to claim 4, it is characterised in that:
The step C3 are as follows:
If all 500 kilovolts of nodes in regional power grid are weak bus, when the region increases 220 kilovolts of websites newly, increase 220 kilovolts of websites are increased newly to the route of 500 kilovolts of nodes, 220 kilovolts of buses, enhance 220 kilovolts of electricity between 500 kilovolts of nodes Gas connection；
If all 500 kilovolts of nodes in regional power grid are strong node, when the region increases 220 kilovolts of websites newly, pass through Connection does not increase by 220 kilovolts of electricity between 500 kilovolts of nodes to other 220 kv substations far from 500 kilovolts of nodes Gas connection；
If the existing strong node of 500 kilovolts of nodes in regional power grid has weak bus again, 220 kilovolts of websites are increased newly in the region When, by connection to 500 kilovolts of weak bus sides, the trend for weakening 220 kv grids is passed through.
6. a kind of transmission and distribution network coordinated planning method for considering strong or weak relation according to claim 1 or 2, feature exist In:
The step A successively the following steps are included:
Step A1, the electrical link of 500 kilovolts and above being located between 500 kilovolts of nodes in power grid to be planned is deleted The admittance matrix Y between each node is established after equipment:
In above formula, as i ≠ j, YijFor the transadmittance between node i and node j, as i=j, YijFor the self-admittance of node i, i =1,2 ..., K, j=1,2 ..., K, K are 500 kilovolts and following voltage class node total number in power grid to be planned, and M is to be planned The number of 220 kilovolts and following voltage class node in power grid；
Step A2,220 kilovolts and following voltage class node are eliminated by matrixing, obtains the admittance between 500 kilovolts of nodes Matrix YY:
Step A3, the electrical distance matrix S between each node is calculated according to admittance matrix YY:
In above formula, as i ≠ j, ZijFor the transfger impedance between node i and node j, SijIt is opposite between node i and node j Electrical distance, as i=j, ZijFor the self-impedance of node i, SijFor the reference electrical distance of node i, i=1,2 ..., N, j= 1,2,…,N。
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